How to sync video and audio on a mp4 file?

Hi I need help on how to sync video and audio on a mp4 file I downloaded. The audio is behind and the video and nowhere in sync with the audio. I play the mp4 file on my phone same issue. play it on my computer same issue. Does anybody know of a program or a windows program that can help sync the audio and video... show more Hi I need help on how to sync video and audio on a mp4 file I downloaded. The audio is behind and the video and nowhere in sync with the audio. I play the mp4 file on my phone same issue. play it on my computer same issue. Does anybody know of a program or a windows program that can help sync the audio and video together on a mp4 file and thank you

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Answers

Best Answer: If you use VLC Player, you can easily sync the audio with the video. Here's how you can do that:
https://www.vlchelp.com/syncing-audio-vlc-media-player/

But if you want permanent fix, you may want to use a video editor where you can easily drag the audio track wherever you want. Of course, if you don't want to go that crazy about it, you can also use QuickTime Pro, which is a great tool for exporting videos in all kinds of sizes and formats as well as fixing this sync issue.

YAMB can fix this although it is a big pain.
if you can't figure that out, you can try AVIDemux. sometimes that fixes it, though it depends on the player to obey the setting, which some cheaper ones do not.

All you have to do is download Quicktime, which is probably already on your computer, and buy a Pro license for, I think, $30. You can then separate the video and audio, slip the sync on the audio and then re-attach the audio to picture.